94 is the first year of the sn95. Those had a lot of electrical yrouble, if I remember right.

 

should I to a pressure test on the cooling system, or a compression test at the plugs.

 

You can pressure test the cooling system, but if it's compression getting into the cooling system, then it will best be identified by removing all of the spark plugs before you run the test. Really the easiest way to tell is to get a small pop bottle and fill it with water. Take the hose that runs from the recovery tank to the radiator off at the recovery tank, and put the hose in the bottle, and rev the engine. If you have bubbles in the bottle, you've got a problem. If it's bad enough, you should be able to leave the hose on the recovery tank and see bubbles in the recovery tank. You can also run the engine cold for a minute or so then remove the cap. You shouldn't lose any coolant. If you do, there's another sign, because pressure in the cooling system should not build that fast.

 

Be sure to let me know what was wrong with it when you figure it out.

 

I say headgasket also.

 

yeah arent headgasket problems fairly common with the early sn95 3.8's?

 

Yeah they are pretty common for headgasket failure. I replaced mine probably about 6-8 months ago.

 

Well damn I just replaced the a year ago, I tried some gasket seal, it got rid of the heavy steam coming out back. But still doing overheat problem, I hate this car anybody wanna buy it! LOL.

 

So run this test with the plugs out, but If it has a loss of pressure, I would think that there wouldnt be enough pressure to put on the radiatot cap to let bubbles go threw. Im confused how to do this or what it does.

 

Pressurize the cooling system with the plugs out. If you lose pressure, and have no external leaks, you know it's going into the combustion chamber, and the heads have to come off.

If you remove the hose from the recovery tank, put it in the bottle of water with the engine running, and have bubbles, you know again that you have problems. It may be bad enough that you can leave the hose on the recovery tank, run the engine, and see bubbles in the recovery tank. It would be even quicker to remove the radiator cap, start the engine, and see how long it takes for coolant to overflow, or just run the engine for a short time, (I'm talking a minute max in all of this) then remove the cap and see if it had pressure. If it had pressure, or if the coolant overflowed in a short amount of time, the heads need to come off.

I can tell you now that if you had steam coming out of the tailpipe, and you poured stop leak into your cooling system, and the steaming quit, the heads have to come off of the engine. It could be a matter of whoever replaced the head gaskets didn't surface the heads when they needed to be, re-installed a cracked head, or improperly torqued the head bolts. If you keep driving the car, it's going to cost you an engine.